Hypselodoris maridadilus

Hypselodoris maridadilus is a colorful sea slug found in the Western Indian Ocean, ranging from South Africa to the Red Sea. This nudibranch has a body that can be white, cream, or yellow, marked with five purple longitudinal lines and a mantle bordered in purple. The gills and rhinophores are bright orange, which helps differentiate it from similar species like Hypselodoris whitei, known for its white-tipped rhinophores and gills. This species can grow to at least 35 mm (1.4 in) in length. Typically inhabiting shallow waters, Hypselodoris maridadilus is found at a depth of around 2 meters, often on limestone rock surfaces. Its diet consists mainly of sponges, which it grazes on using specialized mouthparts. As a simultaneous hermaphrodite, it exhibits a mating behavior where individuals may compete to determine which will take on the male role during reproduction. Eggs are deposited on surfaces, where they develop into a planktonic larval stage before growing into adults. Encountering this nudibranch while diving can be an interesting experience, as divers may spot its distinct colors and patterns on rocky substrates. With records from 90 dive sites, it is a notable species for divers exploring its habitat. The conservation status of Hypselodoris maridadilus has not been assessed, suggesting that more research may be necessary to understand its population dynamics.